Patent US4392003A successfully refreshed from Google Patents.
US4392003A
Expired / Lapsed
US
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Isobutene by dehydroisomerization of normal butane
Assignee: BP PLC
•
Filing: 1981-06-08
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Granted: 1983-07-05
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Expires: 2001-06-08
Abstract
Abstract This invention relates to a method of dehydroisomerizing n-butane by contacting at elevated temperatures a feedstock containing n-butanes with a catalyst composition containing a gallium compound on a support. The process affords a valuable method of producing iso-butene which is a basic chemical feedstock for a number of products including polyisobutenes, methacrolein and methyl tertiary butyl ether, to name a few. The last named compound can be prepared by reacting isobutene with methanol and is a convenient means of separating iso-butene from the products of the dehydroisomerization stage.
Inventors
- 👤 Alexander J. Kolombos
- 👤 Clive D. Telford
- 👤 Dennis Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:17
CPC Classifications
C; C07; C07C; C07C11/00; C07C11/02; C07C11/08; C07C11/09; C07C5/00; C07C5/32; C07C5/373
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
76 words
A process for dehydroisomerisation of a hydrocarbon feedstock containing normal butane to isobutene which comprises bringing the feedstock at an elevated temperature into contact in a single stage with a catalyst composition comprising an element from Group IIIa of the Periodic Table or a compound thereof in combination with a support of α-value below 45, said support being a zeolite selected from the group consisting of an aluminosilicate, a silicalite, a metal tectosilicate, and a boralite.
Claim 2
Dependent Claim
76 words
A process for dehydroisomerisation of a hydrocarbon feedstock containing normal butane to isobutene which comprises bringing the feedstock at an elevated temperature into contact in a single stage with a catalyst composition comprising an element from Group IIIa of the Periodic Table or a compound thereof in combination with a support of α-value below 45, said support being a zeolite selected from the group consisting of an aluminosilicate, a silicalite, a metal tectosilicate, and a boralite.
Claim 3
Dependent Claim
15 words
A process according to claim 1 wherein a gallium compound is deposited on a support.
Claim 4
Dependent Claim
13 words
A process according to claim 2 wherein the gallium compound is gallium oxide.
Claim 5
Dependent Claim
20 words
A process according to claim 1 wherein gallium ions from a gallium compound are exchanged with cations on the support.
Claim 6
Dependent Claim
29 words
A process according to claims 1, 2, 3, or 4 wherein the concentration of gallium in the catalyst composition is between 0.05 and 20% by weight of the support.
Claim 7
Dependent Claim
39 words
A process according to preceding claims 1, 2, 3, or 4 wherein the dehydroisomerisation reaction is carried out by passing the feedstock in the vapour phase over the catalyst composition maintained at a temperature between 350° and 700° C.
Claim 8
Dependent Claim
28 words
A process according to claims 1, 2, 3, or 4 wherein the isobutene formed is separated from the dehydroisomerisation reaction products by conversion thereof into methyl tertiarybutyl ether.
Claim 9
Dependent Claim
22 words
A process according to claim 7 wherein the conversion to methyl tertiarybutyl ether is achieved by reacting the dehydroisomerisation products with methanol.
References Cited (Backward Citations)
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Cited
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EP0024930A1
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US4304686A
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US4324940A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-07-04 | 1987-01-03 | 1987-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-07-04 | 1991-01-03 | 1991-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-07-04 | 1995-01-03 | 1995-07-05 | $7700.00 | Window Closed / Lapsed |